It is very difficult to expand a tree with the mouse. In rpmdrake it is not possible to expand the tree items with the mouse nor the keyboard.
If I select an item, it is highlighted. If I select a second item, the first will stay colored, but with a lower intensity.
Double click on the items has no effect on expanding the tree.
Only if I leave the window and re-enter at the desired item to expand, the ">" will turn blue and with a mouse click the item expands, but only every odd time.
I have Mageia 4 with latest updates, and am using xfce.